Being 20% (or more) over your ideal weight as indicated by height/weight charts has been linked to increased risk of high blood pressure, diabetes, certain types of cancer, osteoarthritis, gallstones, and heart disease. Being overweight by even a few kilograms can also lead to a host of physical and psychological challenges. Unfortunately, even when people cut down on kilojoules, they still may not lose kilograms if they're eating high-glycemic-response foods, which set people up for weight gain. Scientists have concluded that if one could control his/her glycemic response to foods, one could control the way the body uses energy and creates and stores fat, and possibly help avoid disease.